<template>
  <div class="app-container">
    <el-form label-width="120px">
      <el-form-item label="讲师名称">
        <el-input v-model="teacher.name"/>
      </el-form-item>
      <el-form-item label="讲师排序">
        <el-input-number v-model="teacher.sort" controls-position="right" min="0"/>
      </el-form-item>
      <el-form-item label="讲师头衔">
        <el-select v-model="teacher.level" clearable placeholder="请选择">
          <!--
            数据类型一定要和取出的json中的一致，否则没法回填
            因此，这里value使用动态绑定的值，保证其数据类型是number
          -->
          <el-option :value="1" label="高级讲师"/>
          <el-option :value="2" label="首席讲师"/>
        </el-select>
      </el-form-item>
      <el-form-item label="讲师资历">
        <el-input v-model="teacher.career"/>
      </el-form-item>
      <el-form-item label="讲师简介">
        <el-input v-model="teacher.intro" :rows="10" type="textarea"/>
      </el-form-item>

      <!-- 讲师头像：TODO -->
        <!-- 讲师头像 -->
        <el-form-item label="讲师头像">

            <!-- 头衔缩略图 -->
            <pan-thumb :image="teacher.avatar"/>
            <!-- 文件上传按钮 -->
            <el-button type="primary" icon="el-icon-upload" @click="imagecropperShow=true">更换头像
            </el-button>

            <!--
                v-show：是否显示上传组件
                :key：类似于id，如果一个页面多个图片上传控件，可以做区分
                :url：后台上传的url地址
                @close：关闭上传组件
                @crop-upload-success：上传成功后的回调 -->
            <image-cropper
                        v-show="imagecropperShow"
                        :width="300"
                        :height="300"
                        :key="imagecropperKey"
                        :url="OSS_PATH+'/oss/file/teacherAvatarUpload'"
                        field="teacherAvatar"
                        @close="close"
                        @crop-upload-success="cropSuccess"/>

        </el-form-item>



      <el-form-item>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="saveOrUpdate">保存</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>

import * as teacher from '@/api/edu/teacher'
import ImageCropper from '@/components/ImageCropper'

import PanThumb from '@/components/PanThumb'



export default {
    //声明使用的额外组件
    components:{ImageCropper,PanThumb},
    data(){
        return {
            teacher:{
              sort:0,
              level:1
            },
            
            OSS_PATH: process.env.BASE_API, // 接口API地址
            imagecropperShow: false, // 是否显示上传组件
            imagecropperKey: 0 // 上传组件id
        }
    },
    created(){
        this.init();
    },
    watch: {
      $route(to, from) {
        this.init()
      }
    },
    methods:{
        init(){
          if (this.$route.params && this.$route.params.id) {
            const id = this.$route.params.id
            this.getTeacher(id)
          }else{
            this.teacher = {sort:0,level:1}
          }
        },
        saveOrUpdate(){
            if(this.teacher.id ){
              this.updateTeacher(teacher)
            }else{
              this.addTeacher(teacher)
            }         
            this.$router.push({path:'/teacher/table'})
        },
        addTeacher(){
            teacher.addTeacher(this.teacher)
                .then(response =>{
                    this.$message({
                        type: 'success',
                        message: '保存成功!'
                    })

                })
        },
        getTeacher(id){
            teacher.getById(id)
              .then(response =>{
                  this.teacher = response.data.item;
              })
        },
        updateTeacher(id){
            teacher.updateById(this.teacher)
              .then(response =>{
                this.$message({
                        type: 'success',
                        message: '更新成功!'
                    })
              })
        },
        //关闭上传组件
        close(){
            this.imagecropperShow = false
            this.imagecropperKey = this.imagecropperKey + 1
        },
        //上传成功后的回调函数
        cropSuccess(response){
            //获取后台返回图片地址,显示在页面中
            this.teacher.avatar = response.url
            this.imagecropperShow = false
            this.imagecropperKey = this.imagecropperKey + 1
        }


    }
    
}


</script>